Around 1966, a NASA team doing work for the Apollo moon mission took several astronauts to a site near Tuba City where the terrain of the Navajo Reservation was believed to be similar to the lunar surface. Along with several NASA trucks and vehicles used for the training session, there were two men wearing complete Lunar space suits.

Nearby a Navajo sheep herder and his son watched what they thought were two strange creatures walking around. Before long, some NASA personnel noticed the sheep herder with his son and decided to speak with them. Since the sheep herder didn't speak English, he told his son to ask the NASA personnel what the strange creatures were. The NASA people quickly explained that they were not foreign creatures, but they were just men in space suits preparing for a voyage to the moon. The boy explained this to his father, who suddenly became very excited. The man spoke to his son, and the son explained that his father wanted to know if he could send a message to the moon with the astronauts. The NASA personnel thought this was a great idea, so they found a tape recorder and recorded the sheep herder's message in Navajo.

When they finished recording the message, they asked the son to translate it. The boy refused. After dozens of people refused, the NASA personnel decided to offer money for a translation of the message, and finally they found someone to do it. The translator listened to the tape recording, smiled to himself and then spoke the message in English:

"Watch out for these guys, they come to take your land."